A throttle body fuel injection system including a throttle body with at least one air intake, a fuel injector coupled to the throttle body at a fuel port and an annular ring coupled to the cylindrical inner wall of the air intake. The annular ring includes a primary fuel discharge orifice adjacent to the fuel port and a plurality of secondary fuel discharge orifices arranged radially around the annular ring for spraying atomized fuel into the air intake.

A throttle body fuel injection system including a throttle body with at least one air intake, a fuel injector coupled to the throttle body at a fuel port and an annular ring coupled to the cylindrical inner wall of the air intake. The annular ring includes a primary fuel discharge orifice adjacent to the fuel port and a plurality of secondary fuel discharge orifices arranged radially around the annular ring for spraying atomized fuel into the air intake.

A throttle body fuel injection system including a throttle body with at least one air intake, a fuel injector coupled to the throttle body at a fuel port and an annular ring coupled to the cylindrical inner wall of the air intake. The annular ring includes a primary fuel discharge orifice adjacent to the fuel port and a plurality of secondary fuel discharge orifices arranged radially around the annular ring for spraying atomized fuel into the air intake.

In at least some implementations, a charge forming system for a combustion engine includes a first fuel supply device having a first passage from which fuel is discharged for delivery to the engine and a second fuel supply device having a second passage from which fuel is discharged for delivery to the engine. The first passage communicates with the second passage so that the fuel in the first passage is combined with the fuel in the second passage.

In at least some implementations, a charge forming system for a combustion engine includes a first fuel supply device having a first passage from which fuel is discharged for delivery to the engine and a second fuel supply device having a second passage from which fuel is discharged for delivery to the engine. The first passage communicates with the second passage so that the fuel in the first passage is combined with the fuel in the second passage.

A throttle body fuel injection system including a throttle body with at least one air intake, a fuel injector coupled to the throttle body at a fuel port and an annular ring coupled to the cylindrical inner wall of the air intake. The annular ring includes a primary fuel discharge orifice adjacent to the fuel port and a plurality of secondary fuel discharge orifices arranged radially around the annular ring for spraying atomized fuel into the air intake.

A throttle body fuel injection system including a throttle body with at least one air intake, a fuel injector coupled to the throttle body at a fuel port and an annular ring coupled to the cylindrical inner wall of the air intake. The annular ring includes a primary fuel discharge orifice adjacent to the fuel port and a plurality of secondary fuel discharge orifices arranged radially around the annular ring for spraying atomized fuel into the air intake.

An adjustment device for a carburetor adjustment valve includes a limit cap and a sleeve to prevent over-operation and destruction. The limit cap having first and second projecting parts formed in the insertion hole. The first projecting part engages a first groove on the shaft part of the adjustment valve to hold the limit cap in a first position where the limit cap and adjustment valve rotate freely relative to the sleeve. The second projecting part holds the limit cap in a second position pushed in from the first position where the adjustment valve having a limited range of rotation. The limit cap has an outer circumferential locking part formed on the outer circumference and the sleeve has an inner circumferential locking part formed on its inner circumference. In the second position, the inner circumferential locking part locks the outer circumferential locking part and prevents rotation of the limit cap.

An adjustment device for a carburetor adjustment valve includes a limit cap and a sleeve to prevent over-operation and destruction. The limit cap having first and second projecting parts formed in the insertion hole. The first projecting part engages a first groove on the shaft part of the adjustment valve to hold the limit cap in a first position where the limit cap and adjustment valve rotate freely relative to the sleeve. The second projecting part holds the limit cap in a second position pushed in from the first position where the adjustment valve having a limited range of rotation. The limit cap has an outer circumferential locking part formed on the outer circumference and the sleeve has an inner circumferential locking part formed on its inner circumference. In the second position, the inner circumferential locking part locks the outer circumferential locking part and prevents rotation of the limit cap.

Disclosed in this description are modifications either attached to, or made as part of, accelerator pump discharge nozzles, tubes or pipes. These modifications include the use of a fuel atomizer plate for carburetors as either a separate device placed beneath or on top of an accelerator pump discharge nozzle, tube or pipe, or simply located in the fuel stream of an accelerator pump discharge nozzle, tube or pipe, or a fuel atomizer plate for carburetors made as a single unit along with an accelerator pump discharge nozzle, tube or pipe. All are used on standard engines and assist in the atomization and homogenization of incoming fuel with incoming air to improve engine performance